Internal motor cleaner



Sept. 19, 1939. E. A. HILL INTERNAL MOTOR CLEANER Filed Dea -J14, 1936 mvzufox 4M Patented Sept. 19, 1939 UNITED STATES PATENT OFFICE INTERNAL MOTOR CLEANER Elgin A. Hill, Pittsburgh, Pa;

Application December 14, 1936, Serial No. 115,724

12 Claims.

This invention relates to an apparatus primarily intended for thoroughly flushing and cleaning the crank case of an internal combustion engine, and important objects of the invention are to provide an efficient and economical device combination and arrangement of parts herein specifically described and illustrated in the accompanying drawing, but it is to be understood that the latter is merely illustrative of an eme bodiment of the invention, and that the actual needs of practice and manufacture may require .certain mechanical variations from the embodiment shown. It is therefore, not intended to limit the invention to the disclosure thereof herein illustrated, but rather to define such limitations to the scope of the claims hereunto appended.

In the drawing wherein like numerals of reference designate corresponding parts throughout the several views:

Figure 1 is a front elevational view, partly in cross section,.of a crank case aner constructed in accordance with the inven n.

Figure 2 is a side view the control valve structure with the body t reof being in cross section.

Figure 3 is a front view of the control valve structure. I I

Figures 4 and 5 are,-i"respectiv,ely, sectional views on lines 4.4 andi--5, Figure 2, extending through all. of the various ports and chambers of the control valve structure.

structure and of the adjusting elements for the};

latter.

Figure 7 is a side view of the valve operating handle.

Referring in detail to the drawing 5 denotes a vertically disposed cabinet having. its interior divided into an upper compartment 5 and a lower,

Figure 6 is a front view of the control valve compartment 1 by a horizontally extending shelf may be closed by hinged doors, respectively indicated at 9 and I0.

A storage reservoir II for a filtered cleaning fluid and a filter container l2 are mounted and supported in the lower compartment 1 of the cabinet 5, and a receiving tank I3, for non-filtered cleaning fluid, a combined fluid delivery and measuring receptacle M, and the entire operating mechanism of the cleaner are mounted and supported in the upper compartmentof the cabinet. It is evident that the cabinet simply provides a housing and support for the various elements of the cleaner apparatus, and that these various elements may be housed and supported in any other suitable manner without departing from the spirit or sacrificing any advantages of the invention.

The storage reservoir ll contains the clean or filtered'cleaning fluid I5, which preferably consists of a comparatively light oil. The storage 20 'reservoir may be mounted upon or otherwise provided with a heater l6, which is preferably electrically operated, and provided with a suitable control switch IT, for heating the cleaning fluid to produce a. consistency best suited to effect the flushing or cleaning operations.

The filter container l2 carries the filter l8 of any suitable materials. The filter is employed for the purpose of filtering the cleaning fluid before the latter is supplied to the reservoir II. The filter I8 is spaced from the top and bottom of the container by a pair of strainers, respectively indicated at l9 and 20, so as not to interfere with the flow of the cleaning fluid into and j from the fllter structure.

A pipe or conduit 2| with necessary couplings connects the upper end oi the filter container l2 with the upper end of thestorage reservoir II to allow the cleaning fluid 15, after having been filtered by passing upwardly through the filter l8,- to overflow by gravity from the upper end of the filter container into the storage reservoir.

The receiving tank I3 is preferably disposed directly over the filter container [2 and stores the unfiltered cleaning fluid 22 as it is drawn from the crank case 23 of an internal combustion engine. The receiving tank is-provided with a suitable gauge 24 to indicate the amount of its contents when nearing capacity.

A pipe or conduit 25, and an interconnected pipe or conduit 26 provided with a regulating valve 21, connect the lower end of the receiving. tank l3 with the lower end of the filter container l2, whereby the unfiltered cleaning fluid 22 will flow by gravity from the receiving tank to the filter container below the filter l8 in the latter. Upon passing upwardly through the filter l8, the filtered fluid will overflow into the storage reservoir through the pipe 2|, and thus com plete the filtration process, which is automatic and continuous so long as there is any fluid to be filtered within the receiving tank.

The combined fiuid delivery and measuring receptacle I4 is suitably supported at the upper end of the upper compartment 6 of the cabinet 5, and is provided for receiving the apportioned quantity of clean or filtered fluid l5 required for each cleaning or flushing operation. The receptacle is provided with an overflow pipe 28 draining into the storage reservoir H, and with a tubular glass gauge 29, which is graduated to visibly indicate the quantity of cleaning fluid contained within the measuring receptacle.

The entire operating mechanism of. the cleaner is compactly located in the upper compartment of the cabinet 5 below the measuring receptacle l4, and comprisesa pump 30, of any suitable construction and preferably driven by an electric motor 3|. The operating mechanism further includes a controllable fluid travel controlling structure 32, which constitutes a most important feature of the present invention.

The control structure 32 is of the plug cock type consisting of a nearly cylindrical valve housing 33, and a hollow tapered valve 34 of the plug type. The valve plug is revolubly mounted in the valve housing and adjustable in a seat 35 of the same contour formed in'the valve housing, and is maintained in the latter by a washer 36 and a nut 31 engaged on the reduced, rearwardly projecting, threaded end 38 thereof.

The valve plug 34 has closed ends, and has its hollow interior divided into a front suction chamber 39 and a rear exhaust chamber 40 by a transversely disposed partition 4|. The peripheral wall of the valve plug is provided With a series of suction ports 42 opening into the suction chamber 39, and which are spaced agraduated distance from each other, as clearly illustrated in Figure 4. The wall of the valve plug is further provided with a series of exhaust ports 43 opening into the exhaust chamber 40, and which are also spaced a graduated distance from each other, as shown in Figure 5.

The valve housing 33 is provided with a pair of suction ports 44 and 45, a pair of exhaust ports 46 and 41, and a pair of port passages 48 and 49, each ofwhich latter is used in common for both suction and exhaust operations in the manner to ,be described.

The suction ports 44 and 45 are positioned to register with certainpf the plug suction ports 42, and the exhaust ports 46 and 41 are positioned to register with certain of the plug exhaust ports 43, while each of the port passages 48 and 49 is elongated to extend across the plug partition 4|, and is positioned to register with certain suction and exhaust ports in the valv plug, though never at the same time.

A pipe or conduit 50 connects the housing suction port 44 with the suction end of the pump 30, and a pipe or conduit 5| connects the housing exhaust port 46 with the exhaust end of said pump. A pipe or conduit 52 connects the housing suction port 45 with the storage reservoir II and includes a pipe or conduit extension 53 extending adjacent to the bottom of the latter.-

A pipe or conduit 54 connects the port passage 48 with the measuring tank l4, and a pipe or conduit 55 connects the other port passage 49 with a hose, conduit or line 56 intended for attachment to the drain aperture of the crank case 23 to be cleaned. The line 56 functions to deliver filtered cleaning fluid to the crank case 23 and for conducting off the fluid from the 5- latter. 1 l

The pipe or conduit 25, provided with a regulating valve 51, connects the body exhaust port 4'! with the filter container. l2, and includes a transparent section 58 preferably disposed paral- 1o lel and adjacent to the gauge 29 of the measuring receptacle M for comparative purposes. A pipe or conduit 59, provided with a regulating valve 60, connects the pipe 25 with the receiving tank I3. 15

A dial plate 6| is fixed to a plurality of apertured, radially disposed lugs 62, which are formed integral with the front end of the valve body 33. An operating handle 63 carrying an indicator finger 64, is pivotally connected, as at 65, 2 to a boss 66 carried at the forward end of the valve plug 34 and projecting outwardly through the dial plate 6|. The indicator finger 64 is normally resiliently forced against the front face of the dial plate by means of a spring 61, which 1. is positioned between the front of the valve plug and the operating handle 63 adjacent to the pivotal connection 65 of the latter.. The operating handle facilitates the adjustment of the valve plug in the valve body, and the finger 64 indicates the position of the valve plug in the latter.

The control structure 32 is designed for four different adjustment operations, in the clockwise direction, to be described. Four short stop pins, 3. respectively identified by the designations l, 2,

3 and 4, are fixed in graduated spaced relation to each other on the front of the dial'plate 6|, and are arranged in the sequence of their use. The stop members are engaged by the free end' of the indicator finger 64 to facilitate the various adjustments of structure 32 required in effecting the cleaning operation, and for terminating the movements of the valve 34 when the latter has been set in the proper adjusted position in the a valve housing 33.

The depression of the operating handle 63, on its pivotal connection 65 against the action of the spring 61, will elevate the free end of the indicator finger 64 to clear any of the engaged 5o stop pins I, 2, 3 and 4, when it is required to make subsequent adjustments of the control structure 32.

In practice the operation of my improved cleaner is as follows:' The used motor oil is 55 drained from the crank case 23 and the hose 56 is attached to the drain aperture of the crank case. The control valve 32 is adjusted by the manipulation of the operating handle 63 to posi- 4 tion the indicator finger 64 against the stop pin 6 L as illustrated in Figure 6. When the valve 34 is so adjusted the various employed ports of the control structure will be in the proper registration, as shown in Figures 4 and 5, for effecting the first operation of the cleaningproeess. 65 The operation .of the pump 30 will draw clean or filtered fluid |5 from the storage reservoir through the pipe extension 53 and pipe 52, through the registering ports 45 aand 42, through the suction chamber 39 in valve 34, through the suction ports 42 and 44, through the pipe 50 and into the pump 30. The fluid is then forced from the latter through the pipe 5|, through the registering ports 46 and 43, through the exhaust chamber 40 in the valve 34, through valve exhaust port 43 in registration with the port passage 48, through the latter, through the pipe 54 and discharged into the receptacle l4 to the quantity required, concluding the first operation of the cleaning process.

The control structure is next adjusted by setports in the valve housing 33. The operation of the pump 30 will draw the cleaning fluid l5 from the measuring receptacle 14 through the pipe 54, through registeredports and the plug suction chamber 39, and through the pipe 50 into the pump 30. The fluid is forced from the latter through the pipe 5|, through respective valve ports and the exhaust chamber 40 in the valve 34, through. the pipe 55, through the line 55.,

and discharged with some force into the crank case 23. The motor is idly run for a short period to agitate the fluid to loosen all dirt, sludge,

grit or other foreign matter in the crank case' and on adjacent exposed and contacted parts of the engine. This concludes the second operation of the cleaningprocess.

The valve 34 of the control structure 32 is now adjusted by setting the indicator finger 64 against the stop pin 3 whereby certain of the ports of the housing 33 and valve 34 will be brought into registration to provide for the travel of the fluid-in the manner to be described. The operation of the pump 30 will draw the now dirty cleaning fluid from the crank case, throughvalve ports and the plug exhaust chamber 40,-

and discharged either into the receiving tank I 3 or into the filter container l2 to complete the third operation. i

It will here be noted that, by closing the regulating valve 51 in -the pipe 25, and opening the regulating valves 21 and 60, in respective pipes 26 and 59, the dirty fluid, drawn from the crank case, will be discharged through the pipe 25 into the receiving tank l3, and will flow by gravity from. the latter into the filter container 12 to be filtered, in the manner hereinbefore set forth. However, by closing the regulating .valves 21 and BI! and opening the regulating discernible through the transparent section 58' I in the pipe 25.

The same cleaning fluid may be reflltered and reused many times in the cleaning operations. when new.or fresh cleaning fluid or filter is required, the storage reservoir I l and the filter container l2, with the filter 18; may readily be removed in their entirety from the cleaner structure and replaced by'others providing the new and'clean fluid and filter, by simply disconnecting and reconnecting the necessary pipe and coupling connections.

The fourth adjustment of the control structure 32 is made by setting the indicator finger 54 against the stop pin 4 on the dial plate 6| whereby the valve 34 will be so positioned relative to the housing 33 to shut off or close all the ports of the latter. When the valve 34 is in the shut off-position, the operation of the pump 30 will be harmless and ineffective, as no fluid can be drawn into the latter when the housing suction port 44 is closed.

It' will be noted that the pipes 54 and 55, connecting with the receptacle l4 and the crank case 23, respectively, are employed for both drawing and exhausting or discharging the cleaning fluid. This is possible as each of said pipes is connected with respective port passages 48 and 43. Each of the latter, being elongated to extend across the plug partition 4|, is capable of registering witha valve suction port 42 on one side of said partition, and with a valve exhaust port .43 onthe other side of the latter, but the relative positions of said valve suction and exhaust ports are such that their registration with respective port passages cannot be effected simultaneously.

Each time that the control structure 32 is adjusted to efiect the various operations of the cleaning process, excepting the fourth or shut off" adjustment, two separate transversely disposed passages extending entirely through the control valve, are produced. The cleaning fluid is first drawn into the pump 30 through one of said passages and exhausted or discharged from said pump 'through the' other of said passages.

It is, of course, obvious that, each adjustment of the control structure, to effect the .various operations of the cleaning process, provides communication, through said control structure and the pump 30, between two different fluid containers of the cleaner structure. The first adjustment of the control structure provides communication between the storage reservoir II and the receptacle l4, the second adjustment provides communication between the receptacle l4 .and the crank case 23, and the third adjustment provides communication between the crank case and the receiving tank I3 or with the filter container I2. 1

The present invention provides a simply constructed and highly efficient device of its kind. The use of the unitary control structure 32 eliminates the 'use of a plurality of separate valves now necessary in effecting the required operations in analogous devices now in use for the purpose set forth.

With the foregoing description taken in connection with the accompanying drawing, the construction and the method of operation of .my improved cleaner will'be readily apparent to those skilled in the art to which the invention appertains, and while illustrating and describing a preferred embodiment of the invention, it is to be understood that changes in the form, proportions and details of construction may be resorted to that come within the scope of the appended claims.

What I claim is:

1. Inc. crank case cleaner, the combination of a filtered fluid storage reservoir, a fluid measuring element, a filter. container, a filter mounted in said container and being spaced from the top and bottom of the latter, a top strainer for straining filtered fluid mounted at the top of voir and with said container for conveying filtered fluid from said top strainer to said reservoir by gravity, a fluid travel control structure, a

motor driven pump, conduits respectively connecting said structure with the crank case, with said reservoir, with said element, and with said pump, said structure being controllable to provide, during the operation ol said pump, for selectively delivering fluid from said reservoir to said element, or from said element to the crank case, or from the crank case to the said 1 bottom strainer in said container.

2. In a crank case cleaner, the combination of a filtered fluid storage reservoir, a fluid measuring element, a filter container, a filter mounted in said container and being spaced from the top and bottom of the latter, a top strainer for straining filtered fluid mounted at-the top of said container, a bottom strainer for straining non-filtered fluid mounted at the bottom of said container, a conduit connected with said resertered fluid from said top strainer to said reservoir by gravity, a fluid travel control structure, a motor driven pump, conduits respectively connecting said structure with the crank case, with said reservoir, with said element, and with said pump, said structure being controllable to provide, during the operation of said pump, for selectively delivering fluid from said reservoir to said element, or from said element to the crank case, or from the crank case to said bottom strainer in said container, the conduit connecting said structure with the crank case being common for conveying fluid from said structure to the crank case and for withdrawingfluid from the crank case.

3. In a crank case cleaner, the combination of a filtered fluid storage reservoir, a fluid measuring receptacle disposed above said reservoir, a filter container, a filter mounted in said container and being spaced from the top and bottom of the latter, a top strainer for straining filtered fluid mounted at the top of said container, a bottom strainer for straining non-filtered fluid mounted at the bottom of said container, a conduit connected with said reservoir and with said container for conveying filtered fluid from said top strainer to said reservoir by gravity, a receiving tank disposed above said container for receiving non-filtered fluid, a conduit connected with said tank and with said container for conveying non-filtered fluid from said tank to said bottom strainer by gravity,- a fluid travel control structure, a motor driven pump; said'structure being controllable to provide, during the operation of said pump, for selectively delivering fluid from said reservoir to said receptacle, or from said receptacle to the crank case, or from the crank case to said tank, and conduits respectiveiy connecting said structure with the crank case, withsaid reservoir, with said receptacle, with said tank, and with said pump.

of said container, a bottom strainer for straining non-filtered fluid mounted at the bottom of said container,'a conduit connected with said reservoir and with said container for conveying filtered fluid from said top strainer to said reservoir by gravity, a receiving tank disposed above said container for receiving non-filtered fluid,

a conduit connected with said tank and with said container for conveying non-filtered fluid from said tank to said bottom strainer by gravity, a fluid travel control structure, a motor driven pump, conduits respectively connecting,

said structure with the crank case, with said reservoir, with said receptacle, with said tank and with said pump, said structure being controllable to provide, during'the operation of said pump, for selectively delivering fluid fromsaid reservoir to said receptacle, or from said receptacle to the crank case, or from the crank case to said tank, the conduit connecting said struc receptacle being common for conveying fluid to and from said receptacle. I i 5. In a crank case cleaner, the combination of a filtered fluid reservoir, a fluid measuring receptacle, a filter container, a filter mounted in said container and being spaced from the top and bottom of the latter, a top strainer for straining filtered fluid mounted at the top of said container, a bottom strainer for straining nonfiltered fluid mounted at the bottom of said container, a conduit connected with said reservoir and with said container for conveying filtered fluid from said top strainer to said reservoir by gravity, a receiving tank disposed above said container for receiving non-filtered fluid, a conduit connected with said tank and with said container for conveying non-flltered fluid from said tank to said bottom strainer by gravity, a fluid travel control structure, a motor driven pump, a conduit connected with said structure and with the suction end of said pump, a conduit connected with said structure and with the exhaust endof said pump, a conduit connected with said structure and withsaid reservoir, a conduit connected with said structure and with said receptacle and being common for conveying fluid to and from the latter, a conduit connected with said structure and with the crank case and being common for conveying to and from the crank case, a conduit connected with said structure and with said tank and with the conduit connected with the latter and with said container, said structure being controllable to provide, during the operation of said pump, for selectively delivering fiuid from said reservoir to said receptacle, or from said receptacle to the crank case, or from the crank case to said tank or to the bottom strainer in said container, and means carried by the conduit connectingsaid structure with said tank for selectively delivering the fluid passing through said last mentioned conduit to said tank or to the bottom strainer in said container.

6. In a crank case cleaner, the combination of a filtered fluid reservoir, a fluidmeasuring receptacle, a. filter container, a filter mounted in said container and being spaced from the top and bottom of the latter, a top strainer for straining filtered fluid mounted at the top of said container, a bottom strainer for straining nonfiltered fluid mounted at the bottom of said con tainer, a conduit connected with said reservoir and with said container for conveying filtered fluid by gravity from said topstrainer to said reservoir, a receiving tank disposed above said container for receiving non-filtered fluid, a conduit connected with said tank and with said container for conveying non-filtered fluid by, gravity from said tank to said bottom strainer, a fluid travel control structure, a motor driven pump, a

,fluid from the crank case.

.nected with said structure and with the exhaust end of said pump, a conduit connected with said structure and with said reservoir, a conduit con nected with said structure and with said receptacle and being common for conveying fluid to and from the latter, a conduit connected with said structure and with the crank case and being common for conveying fluid to and from the crank case, a conduit connected with said structure and with saidtank and with theconduit connecting said tank with said container, said last mentioned conduits being provided with means operable for selectively directing the fluid through same to said tank or to said bottom strainer, said structure being controllable to provide, during the operation of said pump, for selectively delivering fluid from said reservoir to said receptacle, or from said receptacle to the crank case, or from the latter to said tank or to said bottom strainer, the conduit connecting said structure with said receptacle and the conduit connecting said structure with said tank respectively having transparent portions for visibly displaying the condition of the fluid supplied to and withdrawn from the crank case, and means operable for heating the fluid prior to the delivery of the latter to the crank case.

'7. In a crank case cleaner, the combination of a storage reservoir for filtered fluid, a fluid measuring element, a filter container, a filter mounted in said container and being spaced from the top and bottom of the latter,astrainermounted at the bottom of said container for straining non-filtered fluid, a conduit connected with said reservoir and with said container for conveying filtered fluid from the top of said container to said reservoir by gravity, a fluid travel control structure, a motor driven pump, conduits respectively connecting said structure with the crank case, with said reservoir, with said element, and with said pump, said structure being controllable to provide, during the operation of said pump, for selectively delivering fluid from said reservoir to said element, or from said element to the crank case, or from the crank case to the bottom strainer in said container.

8. In a crank case cleaner, the combination of a storage reservoir for filtered fluid, a fluid measuring element, a filter container, a filter mounted in said container and being spaced from the bottom of the latter, a strainer mounted at the bottom of said container for straining non-filtered fluid, a conduit connected with said selectively delivering fluid from said reservoir tosaid element, or fromsaid element to the crank case, or from the crank case to-said strainer, the conduit connecting said structure with the crank .case being common for conveying fluid from said structure to the crank case and for withdrawing 9. In a crankcase cleaner, the combination of a storage reservoir for filtered fluid, a fluid measuring receptacle disposed above said reservoir, a filter container, a filter mounted in said container and being spaced from the bottom of the latter, a

strainer mounted at the bottom of said container below said filter for straining non-filtered fluid, a conduit connected with said reservoir and with said containerfor conveying filtered fluid from the top of said filter to said reservoir by gravity, a receiving tank disposed above said container for receiving non-filtered fluid, a conduit'connected with said tank and with said container for conveying non-filtered fluid from said tank to said strainer by gravity, a fluid travel control structure, a motor driven pump, said structure being uring receptacle, a filter container, a filter mounted in said container and being spaced from the bottom of the latter, a strainer mounted at the bottom of said container for straining nonfiltere'd fluid, a conduit connected with said reser.voir and with said container forconveying filtered fluid from the top of said filter to said res- 'ervoir by gravity, a receiving tank disposed above said container for receiving non-filtered fluid, a conduit connected with said tank and with said container for conveying non-filtered fluid from said tank to said strainer by gravity, a fluid travel control structure, a motor driven pump, conduits respectively connecting said structure with the crank case, with said reservoir, with said receptacle, with said tank and with said pump, said structure being controllable to provide, during the operation of said pump, for selectively delivering fluid from said reservoir to said receptacle, or from said receptacle to the \crank case, or from the crank case to said tank, the conduit connect ing said structure with the crank case being common for conveying fluid to and from the crank case, and the conduit connecting said structure with said receptacle being common for conveying fluid to and from said receptacle.

11. In a crank case cleaner, the combination of uring receptacle, a filter container, a filter mounted in said container and being spaced from the bottom of the latter, a strainer mounted at the bottom of said container below said filter for straining non-filtered fluid, a conduit connected with said reservoir and with said container for conveying filtered fluid from the top of said filter to said reservoir by gravity, a receiving tank disposed above said container for receiving nonfiltered fluid, a conduit connected with said tank and with said container for conveying non-filtered fluid from said tank to said strainer by gravity, a fluid travel control structure, a motor driven pump, a conduit connected with said structure and with the suction end ofrsaidpump, a conduit connected with said structure and with the exhaust end of said pump, a conduit connected with said structure and with said reservoir, a conduit connected with said structure and with said receptacle and being common for conveying fluid to and from the latter, a conduit connected' with said structure and with the crank case and being common for conveying fluid to and from the crank case, a' conduit connected with said structure and with said tank and with the conduit connected with the latter and with said container, said structure being controllable, during the operation of said pump, for selectively delivering fluid from said reservoir to said receptacle, or from said receptacle to the crank case, or from the crankcase to said tank or to the strainer in said container, and means carried by the conduit connecting said structure withsaid tank for selectively delivering the fluid passing through said last mentioned conduit to said tank or to the strainer in said container.

12. In a crank case cleaner, the combination of a storage reservoir for filtered fluid, a fiuid measuring receptacle, a filter container, a filter mounted in said container and being spaced from the bottom of the latter, a'strainer mounted at the bottom of said container below said filter tor straining non-filtered fluid, a conduit connected with said reservoir and with said container for conveying filtered fluid by gravity from the top of said filter to said reservoir, a receiving tank.

disposed above said container for receiving nonfiltered fluid, a conduit connected with said tank and with said container for conveying non-filtered fluid by gravity from said tank to said.

strainer, a fluid travel control structure, a motor driven pump, a conduit connected with said structure and with the suction end of said pump, 'a conduit connected with said structure and with the exhaust end of said pump, a conduit connected with said structure and with said reservoir, a conduit connected with said structure and with said receptacle and being common for conveying fluid to and from the latter, a conduit connected with said structure and with the crank case and being common for conveying fluid to and from the crank case, a conduit connecting said structure with said tank and with the conduit connecting said tank with said container, said last mentioned conduits being provided with means operable for selectively directing the fluid through same to said tank or to said strainer, said structure being controllable to provide, during the operation of/said pump, for selectively delivering fluid fromsaid reservoir to said receptacle, or from said receptacle to the crank case, or from the latter to said tank or to said strainer, the con duit connecting said structure with said recep tacle and the conduit connecting said structure with said tank respectively having transparent portions for visibly displaying the condition of the fluid supplied to and withdrawn from the crank case, and means operable for heating the fluid prior to the delivery of the latter to the crank case.

ELGIN A. HILL. 

